1 files changed, 73 insertions, 0 deletions
diff --git a/src/win/native/god_window.cpp b/src/win/native/god_window.cpp
new file mode 100644
index 00000000..58fb663c
--- /dev/null
+++ b/src/win/native/god_window.cpp
@@ -0,0 +1,73 @@
+#include "cru/win/native/god_window.hpp"
+
+#include "cru/win/exception.hpp"
+#include "cru/win/native/win_application.hpp"
+#include "cru/win/native/window_class.hpp"
+#include "god_window_message.hpp"
+#include "timer.hpp"
+
+namespace cru::win::native {
+constexpr auto god_window_class_name = L"GodWindowClass";
+
+LRESULT CALLBACK GodWndProc(HWND hWnd, UINT uMsg, WPARAM wParam,
+                            LPARAM lParam) {
+  const auto app = WinApplication::GetInstance();
+
+  if (app) {
+    LRESULT result;
+    const auto handled = app->GetGodWindow()->HandleGodWindowMessage(
+        hWnd, uMsg, wParam, lParam, &result);
+    if (handled)
+      return result;
+    else
+      return DefWindowProcW(hWnd, uMsg, wParam, lParam);
+  } else
+    return DefWindowProcW(hWnd, uMsg, wParam, lParam);
+}
+
+GodWindow::GodWindow(WinApplication* application) {
+  application_ = application;
+
+  const auto h_instance = application->GetInstanceHandle();
+
+  god_window_class_ = std::make_shared<WindowClass>(god_window_class_name,
+                                                    GodWndProc, h_instance);
+
+  hwnd_ = CreateWindowEx(0, god_window_class_name, L"", 0, CW_USEDEFAULT,
+                         CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
+                         HWND_MESSAGE, nullptr, h_instance, nullptr);
+
+  if (hwnd_ == nullptr)
+    throw Win32Error(::GetLastError(), "Failed to create god window.");
+}
+
+GodWindow::~GodWindow() { ::DestroyWindow(hwnd_); }
+
+bool GodWindow::HandleGodWindowMessage(HWND hwnd, UINT msg, WPARAM w_param,
+                                       LPARAM l_param, LRESULT* result) {
+  switch (msg) {
+    case invoke_later_message_id: {
+      const auto p_action = reinterpret_cast<std::function<void()>*>(w_param);
+      (*p_action)();
+      delete p_action;
+      *result = 0;
+      return true;
+    }
+    case WM_TIMER: {
+      const auto id = static_cast<UINT_PTR>(w_param);
+      const auto action = application_->GetTimerManager()->GetAction(id);
+      if (action.has_value()) {
+        (action.value().second)();
+        if (!action.value().first)
+          application_->GetTimerManager()->KillTimer(id);
+        result = 0;
+        return true;
+      }
+      break;
+    }
+    default:
+      return false;
+  }
+  return false;
+}
+}  // namespace cru::win::native